Weapon prices and the auto-buy system

[General Yosif]

I haven't played TF2 for a while and I would appreciate it very much if you fill me in on some things:
I find it confusing now that some weapons have different prices. The vaccinator is 0.33-0.44 ref and the sticky/rocket jumpers are a whole 1 scrap. Who is responsible for this mess!? Why is this happening? Are there more that I am not aware of?
I sent all of my weapons to a fellow new account friend and I had a whole adventure trying to rebuy all my weapons and I am not sure if I had gotten them all.
Let's be honest- Scrap.tf's weapon buy system is awful. There is absolutely no way to sort the weapons and I can't use f3 to search the text. Not only that but the auto-buy system is extremely buggy.
I see that some weapons(even with normal prices) appear in very small quantities in the buy section for weapons.

I am asking you two things:
1- Is there any other site that provides autobuying weapons because this one here is busted?
2- Can you ask Scrap.tf to make a system for buying 1 weapon for each that delivers every time every weapon that exists so I don't pray that the people that buy 30 of one weapon for a raffle doesn't do it this exact moment so I can finish my work. Make a separate inventory for people who want one of each and keep the existing system for buying as well(with tweaks for sorting and visibility). The autobuy system will have the weapons that are more expensive priced accordingly when sending the trade offer.

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