unfair competition?

I recently noticed that, while I am making my bot free mostly, other bot makers are charging from $5 to $12 a month.

The question I want to ask is, does my low price give me an unfair advantage in this? Well I had a day job and set up this bot mainly for fun, there are others who sale the bot for a living.

Just imaging that you have a shop, and some other guy who are playing around setup a shot near you and sales everything you sale for nothing.

Of course the comparison is not valid, as Merc has sold millions of Glider and is much richer than me. But how about the other players?