I've got one of these (in fact identical colour scheme) and its a phenomenal tent. Mine's got well over 3,000 miles hiking on it now, -15c to +45C, deserts, snow camping, the lot, and is still going strong. That's a very cheap price, good luck with the sale.
I've put about 4,000 miles hiking on an ultralight silnylon tent, including Australian and US desert hiking, and many weeks at altitude in the snow. Its been exposed to considerable wear and tear, abrasion etc. It is still going strong - now 10 yrs old - and I'm planning to use it for another backpacking trip this summer.
re wet/dry weight- broadly the thinner the material (and silnylon tends to be very thin) the less scope to absorb water. Even my 10-yr old tent still beads up pretty well, so a couple of shakes and a wipe with a packtowel nearly all the water is gone.
Pack is still a small proportion of my weight - what you REALLY need to do is a get a similarly sized mate to wear your pack, then try and pick them up and imagine carrying all that weight for 20 miles... Whether your tent is wet or dry will, I'll wager, be imperceptible!