Weird Life of buying/ selling stuff

Things have been weird....ever sense i got into buying/ selling regular products like thing one might find at a walmart (Wickmart) retail store. Sometimes i can not find a good deal n am making pennys...then deals come along where find out things were worth way more then i had thought they would be when i purchased them for little. One example being this Fender Stratocaster
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i purchased it for 40 thinking that it was going to be worth maybe 80 most....come to find out it is worth 200-350...i can say that with confidence cause i listed it for a dollar and got a few offers for 200...i will probably sell it for the highest one in the next couple days....(someone offered 275 today...i said yes....they did not come through to get itit's ready to go fast) i figure it will sell faster if i give it to someone at the price they ask for + cash is kinda important to me at the moment, have to make some credit card payments after purchasing all that crypto