This is a good thread. I lead for reasons that have mostly been described above:

1) Multi-way pot means there a good chance someone has a 5 or a flush draw.
2) Loose 25NL players are usually chasing the flush.
3) I lead with AA/KK/AQ here, so I want to represent those hands and make them think they can stack me with a 5 or a made flush.
4) The only hand I might check/call this flop with after raising UTG is AcKc... I know 25NL players probably won't put us on a monster if we c/c, but it's transparent enough that they might.

I think the flop lead usually gets called in this situation. Bad luck Vrax.