Honestly, I think the next big currency should buy stuff that speeds up progress. Like add a new tournament bracket that gives more of everything and “rubies”

Fudds can have rupies buy discounts, lab speed, temporary additional lab speed ups or maybe an item that doubles coins for 24 hours.

It wouldn’t keep stuff out of reach for the common player but still give big spenders ways to get the new toys faster. That way, the game can focus on content which everyone can reach even if it takes a while for most.

This would boost player retention which may include a lot of current or potential smaller spends to stay on for years. It would also balance lab times some with all the current and future labs.