I think current high prices might also have to do with people being out of work due to covid- wanting to work from home now, or being forced to do so? Also, various shortages making costs rise.
And "just because" -some do take advantage when things aren't plentiful. Just remember they're easy to raise.I think MM prices tend to be high- because they have the advantage of being a widely known & reputable platform to advertise from (& it's also easy to find things on).