They have become a feature I come to expect.
During the slow months of the year where not many games are coming out I could maybe consider buying a game with no trophy support.
However during the holydays with more games coming out than I have time to play they are definitly something I look at and if 10 games are on my must- buy list and 2 of those don't support trophies, that list is now 8 games strong...
Which is why I never bought and probably never will buy Valkyria Chronicles .
The developer had 7 months between the Japanese release and the US release to add trophies. They decided not to, they won't get my money.....