Ok i'll add a section detailing why later, the general concept is they are cheap, pay themselves off and with all 4 provide almost everything you need for mid/late game. After a few kills with the high gold input you find a snowballing affect which easily covers to cost of much more expensive items.

You should add WHY so many Avarice blades are bought only to be sold later. I took the liberty of finding out for you:

According to calculations 3 Avarice blades that get sold sets you back about 750g. This is recovered within 8minutes. One by one they need to stay in your bags 8min atleast til you actually EARN something from them.

Oops why did I skill parrrley then lol, thanks for that! I have tried health/armor seals as well as mr glyphs but in general you should never be near enough to danger for them to be worth it, so when you do get in the fight your parrrleys can really do their job.

I like how you skill Parrrley Lv 5 at Lv 8 if it's available at Lv 9 at the earliest point in the game... Everything else quite okay. Standard items, lulz runes because I'd prefer some armor/mres for not being a one-hit.