Yes, thanks. We have a workaround for cases like yours. This is what you’d need to do:
1. Set General > Mode as Product Quantities.
2. Set General > Date range as Last 30 days.
3. Enable the Per product tag (or category) on Limits section.
4. Mark all your products with the same tag or category.
5. Access that specific tag/category page and take note of the tag_ID
on the URL. Let’s suppose it’s 123.
6. Enable the Formula > Limits by formula option and add this to the Formula option:
[alg_wc_mppu term_id="123" limit="10" membership_plan="first_level"]
[alg_wc_mppu term_id="123" limit="20" membership_plan="second_level"]
That wouldn’t cover the need to buy a product only once though.
Let me know if this would be enough for you.