As Valterain said, anyone can learn how to code. All it takes is around 1 month and a lot of patience.
When Fish released the API the market got split in to two groups, one which were either too lazy or impatient to make a bot with this information and the ones who used it or just didn't need it such as Thrandir and Insanity.

Most of you have complained about bots for more than 3-5 months now, in that time you could have made multiple bots.

Saying a market bot is 'unfair' is like saying factories are unfair. Sure you can take 5 hours to make the item or you can make an automated machine to do it for you.

It's funny because Insanity, one of the most well known market users has backed up bots and has even made a tutorial on them.