You can in fact you just need to post a request here:
https://forum.scrap.tf/forum/27-raffles-ip-whitelisting/
Also if you have questions about the site please post them in the help and support section
https://forum.scrap.tf/forum/33-help-support/
I don't know if this counts as helping out of help and support so Neet please don't taze me
what?
a crafted strange is just a strangifier used on a crated item.
Same price as a normal strange.
Backpack adds half the part's price onto weapons and whoever you're talking about selling it for a higher price may be adding strange parts.