The reason is that the term "IPO Stocks" used be HUGE 10 years ago, everyone wanted to get in on hot up and coming high flying tech stocks. Now most IPO's lose share value from their inititial public offering price shortly after going public.
Also, if you check OVT for "IPO's" you will see the results are less than flattering, this is because everyone into stocks already knows where to look for IPO's and have no need to search for them. All 99% of investors have to do is log into the brokerage account and all the IPO info this need is a click away.
Not too many years ago this domain would have been a HUGE sell. Right now I don't see it worth anything more than a forum community site for IPO discussion. Just some of my IMHO.