"I have the opportunity to "upgrade" to a 40D for little to no cost if I so desire."
"In the end my upgrade from the 30D cost me about $30 and it was worth it. You have absolutely nothing to lose so go for it!"
How come??? It is like $500 difference between the two in the online shops and still $400 if you look at the used prices ($1000 for a 40D $600 for a 30D). I would love to know how could I upgrade a 30D to a 40D by paying say $100... I would do it in a heartbeat.