Five words: Smash Bros Tournaments for Games
Or any other multiplayer tournaments, for that matter. They could even have promotions like when you first get the Rev it asks you when your birthday is and when that time comes, it gives you a free download each time. Something like that as a perk
I would buy most of my collection of S/NES just because of the convenience if it is cheap (no SNES game more than $6 CDN). When I lived in Africa I had about 60 games for the NES, and I remember I still wanted to play some more but never got the chance. However, when I moved here the voltage is different (110V compared to 240V) so I had to sell it there. Therefore, I am looking to buy quite a few NES games to remind me.
There are also some games that I really want to play on the Super that I either lost/battery save dead/broke/borrowed from friends and I want to get them. I did, however, buy some games that I still regret purchasing, and there's no way they're wasting my flash space.