The recreational market does spend a lot of money on bikes. Much of it is of questionable gain already, and in the context of Rwanda negative since the recreational bike generally compromises comfort for speed - a fine compromise for recreation but bad one for most Rwanda uses.

However some of what they are spending money on would make those bikes in Rwanda much better. Better/more comfortable seats can greatly ease the toll on your body. Disk brakes would stop the load much better and so make them safer. A couple gears would be nice (assuming it doesn't compromise drive train strength too much). Modern cargo bikes likely have a better cargo position as well.