550,000 exact name monthly searches
1 - make sure these are indeed 'exact' searches in the keyword tool, rather than 'broad'. Many new domainers incorrectly say exact but are looking at the broad search.
2 - it is actually quite common to find dot.info's still available with high exact search numbers; you can often buy them here in the marketplace for x or xx, they are cheap. Couple years ago I sold my few remaining dot.info's for $2 or 3 each, couldn't get any more for them... and they had exact searches ranging from 50K to 1.5mil. Even dot.net terms with large searches are dropping all the time now.
3 - with tens or hundreds of thousands of searches, it is extremely - not a little, but extremely - unlikely that you will develop a site that will get anywhere near page 1 of search engines. Highly unlikely to get it even into the top 50 page results. The strength of 'niche' term minisites is to find a domain that has strong enough searches that it will bring you good traffic, but not such huge searches that you have a ton of competition in getting your website high on the serps. The best minisite candidates were/are terms that get in the high hundreds to low thousands of monthly searches, and have low competition with other sites in the serps.
4 - you can still develop your domain into a minisite and it may still bring you a trickle of adsense income; but without doing a LOT of development, like spending a week or more of full time work on creating a nice site and dozens of quality original content, IMO you have no chance in receiving much traffic; remember that you're still competing with many well-developed websites that are competing for the 500K monthly searchers looking for your keywords. Even if those other developed sites aren't using 'exact match domains', they're still developed strongly and will still beat out weakly-developed exact match domain sites.
5 - google's search algorithm changes in the last couple years have made things extremely difficult for minisites to rank in serps. If you plan some major development and have an interest in the topic of your site personally, then keep going because it's out of personal interest. But if you plan on building a minisite solely to try reap adsense, you'll most likely be running on an uphill treadmill. Adsense earnings have also gone way down the last couple years - with that economy crash, there are fewer advertisers, with lower spending ceilings, utilizing fewer Adword keywords, and spending less on each click.
You can still do it; no harm in experimenting, and maybe you'll do it well enough to earn some income. But do it smart; don't just buy a large-search-term domain.info and expect to build a minisite with adsense and think it will start earning returns. It's a slow game, and if your dot.info beats out any other sites, it may still take the search engines months or years, if ever, to get your site to a position of strength.
Far more productive, if you're set on building minisites, to use niche dot.com's with more reasonable search numbers, like 500 - to 10K at the most. Then you'll have a chance. Not much of one... those of us who have good minisites, myself included, have seen a 50 - 80% drop in adsense income over the last few years. Hard to predict what the search engines will do with a site nowadays. I have a small one-page adsense-based site using a dot.com name that gets searched about 90K per month, and my site gets a lot of that traffic because it is on goog page 1... then I have another adsense-based site that is a niche term and has a dozen good content pages... and two years later I still can't get it to google page one, even though there's hardly any competition for it in serps.
If you're a good site builder you can usually predict how things will go... but it's still largely a crapshoot. Using a dot.info, with a 500K a month search term, building a small adsense based site... personally I feel would be a waste of time, beyond doing it as an experiment if you really have to test the waters for yourself
Good luck, prove me wrong
Oh, feel welcome to PM me the name; I could tell you right away if you have any good chance of making adsense income with it, and what kind of development you'd need for that. I've done hundreds of sites, for myself and others.