I ship stuff all over the US weekly through a corporate account. Also, a snare is heavier than a mid 70s thin ply tom. It is based on dimension and weight - I ran the numbers but I do get substantial discounts. However, lets roll your numbers for conversation sake -$70 is a 26% markup on shipping to your $53. I am not ok with those margins.
Lowball? Same drum is up for sale for $150 from another seller right now. My offer was far from lowball and was a solid fair price offer for a 13" tom from that manufacturer/era. Not that it matters,, but I also did a price history search in eBay prior to making the offer. I bought an 18" floor tom yesterday from the same family for $250 and less than $70 shipping. That $250 was the advertised price. It was fair so I bought it. I can't stand low-ballers so no I am not a lowballer.
Nice try - looks like your just another high priced Reverb guy defending one of your own.
Ok, now that we are done busting each other's balls let me try to save you and your customer's some money. First, I am 100% for the small business owner; my father has been a used merchandise "dealer" for over 60 years and still runs a successful eBay marketplace store in his retirement. If you have large items to send like a multi-boxed drum set, price Greyhound (yes the bus line). They offer substantially cheaper rates since the bellies of those buses remain empty for the most part as they crisscross the US. It does require you and the customer to drop off and pick up at the nearest terminal but the cost savings are often well worth the added time/labor/fuel to do so.
Honestly, I wish you well on your business Vader.