PC my lol account for Rs gp

[5fightinggod]

My lol acc has over 100 skins including pax jax,sivir, riot graves and riot nasus. Currently in diamond 4 and was plat last season. Has 12 full rune pages and every champion with 20k ip. I was wondering how much rs3/07 gp I could get as I would sell it if it was alot.

 

[5fightinggod]

Bump some estimates would be nice

 

[5fightinggod]

Can anyone give a rough estimate? please