I assume it is simply a matter of limited funding.
These free HIV tests are provided by the
Light of Friendship AIDS Control Association which is a non-profit NGO.
It is entirely up to them to decide on the rules, and maybe they consider gay men in Taiwan to be a high priority target (the same way the NZ AIDS Foundation did when they started as a gay support group in the mid 80s).
If any hetero men are too stingy to pay 500 for a test, then they can simply go to any of the three places listed here:
http://forumosa.com/taiwan/viewtopic.ph ... 0#p1361669 Also free, also anonymous.
I suppose it would not be Forumosa if there was not the usual belligerent commentary, even when the news is good, and again...the news IS good:
rapid, reliable, ANONYMOUS HIV tests!