I think you should approach your crushes and tell them you like them--and you want to escalate things further (to see where it leads). That way, you'll probably weed out some that aren't as interested in you as you are to them (that is a good thing) and who knows, you just might end up with a really nice catch!
Besides, what is the worst thing that could happen if you don't TRY? They all diss you and you do what I do....go out and cultivate more!
As an example: A guy here catches my eye (must be single, of course...I am not the homewrecking type) and I'll leave a nice comment on one of his pics, or if he has information in his profile that I find compatable with mine, I'll e-mail him and tell the guy he has an interesting profile. Most of the time, I'll never hear back on the pic comment, but sometimes I will get a "Thanks" on the e-mail. If the response is too short and sweet, I might push it a little more, and sometimes I never hear from him again. His loss I say! If you get a pushback when you mention you are more than interested in a guy, just feel that it's his loss, that's all.
And darn it....post a pic of yourself! I swear you are the most prolific poster in the threads that has a following, but no pic! Interesting! You have more than established your credibility here though!