Its not an easy answer as it touches on multiple things that are set in place so RMT is very much possible in EVE and if very profitable compare to some countries and their economies.
For starters, you can trade everything and anything in EVE, so it makes it possible to transfer not only ISK but items to any other player in New Eden.
Second, a loss matters in EVE. Some players are not willing to spend the time in the game to replace or even get their new shiny ship that they just finished the skills for but rather pay with real money.
While it is possible to get some ISK via PLEX officially, many many first time ISK buyers are actually new players or the ones that recently started playing. Many of those first time buyers did actually not know that it is against the Rules. And that they are doing more harm by purchasing ISK from the black markets.
Some of them we catch, some of them report them-self’s to us but the problem is, that those new players actually...