Why pay for something new when you can make it for the same price but be better? Your never going to get any bolt on accessories to make as much power as porting and polishing which only cost the price of sandpaper
When your selling something like this you have to make a reliable product WHILE keeping build price low
Your not going to be able to do anything to a TRUE bicycle to make it safe at anything above 30mph, that's when you have to be able to drive.... Anyone can own a race car but only a select few can actually DRIVE a race car