You want to adopt comphrensive acceptance testing, but nobody wants to take responsibility for ATs.
Therefore,
Put the programmers in charge of writing their own acceptance tests, and if (when) people start to complain, transfer the responsibility to them.
But,
The idea is to gently shift the responsibility onto the customer, where it belongs.
Evidence/Examples
From the XpMailingList [message http://groups.yahoo.com/group/extremeprogramming/message/21120]:
Only have one source for this ProtoPattern so far. Anyone else ever see/hear of this working?
I have been writing ATs myself, in "XP for one" mode, for 5+ months. No results yet, but I hope for "success" as per this pattern. -- LaurentBossavit