ABSOLUTELY no items. We're adults, so we care about time invested. We can do a fresh start with a VERY temporary high EXP rate period, or transfers of characters with docked prayer exp, magic exp, range exp.

Also, no skill stats should carry over. I say this because pkers CARRY a server. You want to skill and make money? Without pkers, you're not selling rune, ammies, food, bows, pots, or anything else. Sure, stakers will buy super potions, but if you want this server ultimately to end up as a population of 15 with 8 stakers and some AFKers, we've seen that before. Incentivize the pkers of all levels. Allow transfers of all characters with fighting stats.

There are NO negative side effects, unless you have a majority of pkers voting for a fresh start, committing to re training.

Pkers are not the #1 client users.
I can high alch stuff made so that theory is out the window..

You, the 85+ fletcher, 85+ woodcutter CAN high alch stuff. Have fun high alching your amulets, swordfish, sharks, death runes, air runes, fire runes, law runes, bronze/steel/mith/addy/rune arrows, super potions, and anything that's not junk rune or a magic longbow.

Pkers aren't the #1 client users? I've played roughly 20 private servers over the past 10 years, and a server without regular pkers is effectively a dead server 100% of the time. You want to play alone and high alch all those bows by yourself? Something tells me the admins here won't be too pumped if that's what plays out.