(Original post was edited to remove "for free".)
Providing a service is useful. But not if it drains
too much energy/focus. On the other hand, when
you provide one service people might stick around
for another, and even start helping others.
Especially if there will not be a way to filter the
browsing experience on Typophile, I suggest that
Punchcut conduct a quick statistical analysis that
aims to find out: what proportion of people who ask
for type IDs never do anything else here. If we find
that most people who get IDs here only use this site
for that purpose, I propose that we start charging
US$1 per ID request.
Although this might raise a modest sum over time,
the main goal is to discourage ID parasitism. But that's
assuming ID requesters don't hang around for much
else; if they do, I for one wouldn't mind keeping it free,
but then filtering would be needed after all.