I don't understand the comment about goodness of fit. Capital fits pro very well. Here are text string Google uniques;
Capitalpro - 37,400
Capitalcom - 4,000
ProCapital - 126,000
ComCapital - 1,410
One of the ratios I look at to measure goodness of fit with .pro is total Google uniques for the keyword versus Google unique for the keyword and extension without quotes. So for example;
Capital- 400m
Capital Pro- 74m (ie. Google indexed pages that include a reference to Capital and Pro)
That 74/400 ratio is extremely high. Take some obvious brilliant .pro fits
Golf- 423m
Golf Pro - 6.8m
=7/423
Training- 546m
Training Pro - 17.3m
=17/546
When I'm considering goodness of fit I use about 20-25 different benchmarks to gauge fit. For example, how many keywordpro.otherextensions are registered, how many resolve, how many are developed, how many keywordpro.gTLD's are not regged, the year the keywordpro.com was regged, how many Google indexed pages have keywordpro in the url, the same Google ratio I used above for training pro but for training professional.
The underlying reasons Capital fits Pro is that Capital and Professional are connected. Professionals often to work in a country's Capital city, professionals manage capital, to set up a business you need capital and professionals, Capital Pro conveys two qualities, 1) a business is based in the capital city or a big city, most big businesses are, and 2) you are professional and very good at what you do, every business wants to project that. Hence Capital Pro, conveys a central location and the fact you know what you are doing. That logic is why you get 37.400 references to CapitalPro in Google. It's completely absence when paired with .com, hence the negligible Capitalcom and ComCapital stats.
If you pair com with something that implies technology or communication, the com branding value goes up. For example, com can stand for communication, alot of communication is digital;
Digitalcom - 24,900
ComDigital - 13,200
But don't worry, pro has it covered. Digital is a technology keyword and tech people like to be regarded as pros. Hence;
ProDigital - 670,000
Digitalpro - 1,030,000
I don't disagree with Microguys wholesale valuation at high $XX to low $XXX. As Vincent's auction of .pros showed, unless you have a spectacular fit between a keyword and .pro like Studio.pro or a blockbuster domaining keyword like Diamond.pro, other domainers won't pay much for it.
I look at my .pro and .info domains as buns baking in an oven. I'm currently developing my .coms but at some point, I will need more domains. I don't want to pay a .com domainer $XXX,XXX for an average .com so I have to bake my own. .pro dough is cheap, but reg fees are high so the electricity for the oven is expensive, and there are restrictions so only certain people are allowed to bake.
There is no point rolling your .pro dough, putting it in the oven, watching the clock tick for 6 months, then pulling the unbaked buns out and asking Microguy how much they are worth. People don't have an appetite for half-cooked buns.
You have to decide how many buns you can afford to bake, then close the oven door and come back in 5-10 years. The buns will either be worthless or the kitchen will be filled with the smell of hot .pro buns, you will get your smugshot on DNJournal with a "Domain Rocky" story about how you ran up $100,000 of credit card debt and pimped your wife out so you could pay your domain reg fees.