First ~ You are doing a great job
Second ~ If you offer some with tracking, some without tracking, some with cover, some without covers...some with etching, some without, you will be setting yourself up for one big heck of a headache I'd try to keep it the same as possible to avoid that headache for yourselves. The only thing Idaho did to lessen the cost for some was you had the option of having them etched with your alias or not. Those that wanted to save opted not to. Now they wish they did!! Whatever you do, it will be a success and collectors will buy them even if it cost a few pennies more.
Third ~ Refer to #1