colecovision #1 expansion module 1982 factory sealed + gameboy advance factory sealed

i first picked up gameboy advance factory sealed off a hippy with 5 games for 50$ not realising the sealed gameboy
was actually worth 225$ i have it posted on ebay, the 5 games paid the 50$ so im left with 225 profit

i then found a guy selling a colecovision #1 expansion module 1982 factory sealed iv been told it could be worth 500-1000$ on ebay but i
think to myself why not more? its factory sealed so hard to get your hands on 31 years old, i paid 100$ for that item

my ebai name is knuckles3043 if anyone would like to see

i also got a donkey kong handheld 1982 for 50$

i think all three of these items are kind of rare to find and at these prices

i just got into the game dealing again in october iv so far made thousands, i have final fantasy 3 snes mint cib and mega man x 2 mint cib

please let me know what you think my coleco may be worth before i sell its listed for 1000$