imo profitable routing nodes will be very few and far between. Most large lightning nodes today only exist because they are providing a service that requires running a lightning node, they aren't doing it for purely routing sake. The ones that are able to profit purely routing have to get an edge from somewhere and normally that is just being extremely well capitalized.

my node is profitable but that is only because of opreturnbot.com, otherwise it would just be a money sink that i do for fun