@Tanooki: Unlike vintage boots ie "999999-in-1" BS, these latest multicarts actually contain the advertised number of games on them. The newer multicarts are MMC3 multicart maper built on 32mbyte flash ROM. They have a good chunk of bankswitched CHR RAM which serve the purpose of CHR-ROM once a game is selected, the CHR data is copies over. Storage is cheap and most mappers can be easily converted to MMC3 by pirates. The 150-in-1, 298-in-1, 340-in-1, amd 400-in-1 all fill the 32mbyte flash chip with games. The lower the number, the larger, quality titles can be included and less filler especially the Taiwanese NROM junk found near the end of the bigger multis. Sure Bonk, BB2, and a few other unicorns are missing from the 150-in-1, but overall less filler junk.

I see the bootleg multicarts as not pretending to be something it's not, ie vintage period release. Nobody's gonna mistaken it for an original or rip collectors off on eBay.