I looked through the website carefully, which should be considered the authority over magazine articles (didn't read) and chat room (the antithisis of authority). It has a 'how to join' section as follows :
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How to Join the IPT
The International Pool Tour is open to all men and women, amateurs and professionals, anywhere in the world. Membership dues are $899.00 for a lifetime membership. IPT members pay minimal entry fees and are invited to all IPT events, with the exception of certain invitational events.
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Nowhere on the site does it say anything about qualifying nor limiting the number of members (on the above page or any other for that mater). Again, where did you hear this 150 player limitation, and was there any mention of how the list will be managed ? Just cite your references dude, don't say 'find it yourself' ! Of course if it is from some chat room then never mind, we know how authoritative they are
Dave