Honestly I feel like alts aren't the problem, the same problem with every rsps is the whale donors who spend thousands in game to get bis items, and don't bother with buying/selling other items to keep the eco afloat. The 1% of the richest who just camp the end game bosses and keep all of the loot for themselves. Either selling at prices too expensive for us normies to afford or keeping dupes in the bank never to be sold.
I'm happy making 30m+ per hour mining on my alts, or doing some bossing for 20-50m/hr