A graphically-updated version of Mario Bros. was included with every single GBA game with Mario in it(well, the Mario Advances and M&L Superstar Saga) and that didnt' stop Nintendo from re-releasing that.
i was under the same impression, until i actually got a gba, and bought a few of the mario advance games...in fact, the mario game included on all of those cartriges is "mario classic". it is not Super Mario Bros. from NES, but is (apparently) an old arcade game, more in the lines of the old Donkey Kong. so when they came out with SMB1 for gba, i was quite happy to drop $20 on it.
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i was under the same impression, until i actually got a gba, and bought a few of the mario advance games...in fact, the mario game included on all of those cartriges is "mario classic". it is not Super Mario Bros. from NES, but is (apparently) an old arcade game, more in the lines of the old Donkey Kong. so when they came out with SMB1 for gba, i was quite happy to drop $20 on it.