1) Use trade offer! No need add me or something else
2) I dont accept your offer if you have trade hold! So just use Steam Guard!
3) Pls. read description on site.
4) Make sure you do not confuse the buying and selling.
5) Examples how to count correctly:
10 ref - 2 scrap = 9ref, 2 rec, 1 scrap. or 10-0.22=9.77 (not 9.88)
10 ref - 1 rec = 9ref, 2 rec. or 10-0.33=9.66 (not 9.77)
18.77 ref * 13= 244.11 ref (not 244.01 becous 18,77 in fact is 18,7777777777...)