It's not fuss. It's a debate. Remapping is a controversial subject, so you will get a lot of opinions, which you can either ignore, take offense to, or add more of your own. It's how forums work.
Revo costs what it costs because of their provenance and expertise. R Tech are more recent but making a good name for themselves. People trust these vendors. Trust is worth paying for.
Yes there are many vendors that SELL maps, but only a handful that actually WRITE them. The internet is full of plagiarized maps.
I could remap my car myself for £20 if I really wanted to, but I prefer to support small businesses and help keep the tuning market afloat.