Ugh, my heart. Kill me now! I'm still convinced that he has a thing for you so that made me wanna pounce on him and just shake him while yelling at him to make a move already.
Either he put the pieces together or he went there secretly hoping that maybe, just maybe, you'd be there. Oh, goodness. That'd be so wonderful/beautiful/adorable. My heart is melting for you.
You won't pay for the convention because he's gonna be so madly in love that he's going to do this because he wants to since he knows it'll make you happy. Then when you least expect it or on your birthday or Christmas or whatever, he'll be all, "BAM! YOU'RE GOING TO A SPN CONVENTION!"
Well here's the solution. He needs to grow a pair of balls, ask you out on a date so you two can chat and really get to know each other while doing something fun or whatever it is that is decided. Go on many wonderful dates and fall madly in love with you. That's what needs to be done. He needs to get on that.
I honestly think this boy is somewhat into you or he's at least flirting with you based on what I've read in your journals. But, you know, reading about it always sounds so wonderful and you never really know unless you see it.
HE JUST NEEDS TO BE TOTALLY INTO YOU AND ASK YOU OUT ALREADY!