You may not be interested in buying one, but you apparently don't even understand the market. There are currently at least 4 different SNES flash carts in production (Mash Mods, Tototek, Neoflash, RetroZone). The PowerPak is high priced because its damn complicated and uses expensive components, and is still cheaper than the chinese neoflash cart. The other 2 are the cheapest, but do not use memory cards. The PowerPak price is right in line or cheaper than flash carts for every other retro system.
DS flash carts are cheap because they are simple and made by the MILLIONS by chinese companies. The production volume for retro carts just doesn't exist for huge discounts.