My lease is up on my 2020 GLC63 at the end of August and the plan is to buy it and sell it shortly thereafter. I have the opportunity to get it certified by my dealer at that point, probably to the tune of somewhere around $2500 all-in. If I was going to keep it, that'd be close to a no-brainer, but given I plan to sell it, does it make sense? Will I get it back via a higher sales price or is it a waste of cash?