Check if a warehouse club membership pays for itself.
A warehouse membership pays for itself only above a certain spend, and the fee is not the only cost — clubs are usually further away, so extra driving belongs in the calculation. Gross savings are the discount percentage applied to what you spend there; subtracting the fee and the fuel gives the net benefit, and the break-even spend is the threshold that decides whether to renew.
Membership net benefit
Net benefit = annual club spend x saving percent/100 - membership fee - extra driving x 12; break-even spend = (fee + yearly driving) / (saving percent/100)
Above the break-even spend, yes. Below it the fee and the extra travel exceed the discount, which is common for small households.
Only if the cashback percentage on your actual spend exceeds the extra fee. Run the same comparison with the higher fee and the cashback rate.
That is the main risk. Bulk-driven overbuying can wipe out the discount, so treat the saving percentage as applying only to items you would have bought anyway.