[Janteh]

Buy tickets for popular sport/music events, sell for double the money when the venue is sold out. Repeat.

Not that I agree with this kind of business from an ethics point of view, but it's easy money.

[rjett]

If one could make $25000 in a month doing this, then I think there would be quite a few people considering career changes.

[goatforce5]

A roommate of a good friend makes a very good living doing this. I'd guess he must be holding many tens of thousands of dollars of tickets at any one time, and significant effort goes in to acquiring the tickets in the first place.

[jagbolanos]

there is quite a bunch of people that do it in soccer games all over the world, specially latin america