What is gaming convenience worth to you?

I love Battlefield 2. I've logged more hours into that game than any other. I bought all the individual add-ons at full pop. But I've also logged more time troubleshooting that game's issues than any other. It's a pain to re-setup each time I upgrade. It's very temperamental, and the patch/addon sequence is, well, stupid. I'd love to have it all taken care of for me...

...like with Steam.

Steam sells the Battlefield 2 package for $29.99... not bad... but I already paid around $100 for this game. I really want to bite the bullet and just pay the money and make the whole game install shenanigans go that much easier... but it's the principle, dangit! Steam only has a handful of supported retail non-Steam games that they'll import the CD-Key for... for the rest, you just have to install the good ol' fashion way.

I was thinking $10. I would part with $10 for the convenience of Steam managing my Battlefield 2. What do you guys think? If you use Steam, and see a number of games that Steam sells that you have a retail copy for, but that they don't support that retail Key, what would you pay for the convenience of Steam? Or what kind of discount would you expect? (Other than the ideal of free, of course).

Comment below.

(P.S. Yes, I found out that I missed out on 75% off on the BF2 package over the holidays, and yes, I'm beating myself up over it - which leads to other idea: could Steam allow you to "tag" games in the shop that alerts you when they go on sale? Hmmm.)