@Lee_3120Airsoft As others have stated, the purpose of this thread is to highlight adverts which are potentially exploitative or (as the title says) living in the clouds.
If you look back over the last few pages or so there have been various adverts which have received criticism for a variety of reasons but namely due to over ambitious pricing. Just because you paid £120 (example price) for something doesn't mean it retains that value, or even 90% of that value. Quite the contrary, as virtually all goods in airsoft are subject to wear and tear thus increasing depreciation. You also need to factor in manufacturer, model and condition.
In this particular instance you're attempting to sell a HFC pistol, a brand which is far from well regarded and which is firmly in the budget end of the price spectrum due to the product quality and usual pricing. Unfortunately in this particular instance it sounds as though you got caught you by one of the more nefarious retailers in the market and overpaid significantly.
I'd also suggest taking time to consider the advert itself. If you're looking to sell something then right off the bat you need to have high quality pictures which show what you're attempting to sell at its best, something which your current advert completely fails to do. Secondly you need to price the item accordingly, based on the above criteria, should you have uncertainty or doubt about it's value there's always the appraisal section of the forums.
Finally the way you decide to communicate and interact with the community goes along way. As it stands you're new to the community here with no previous seller/buyer feedback and with no post history on this forum, something which will immediately sound alarm bells for most. While it's disappointing to hear that a product you paid for is worth significantly less than you expected you have a few different choices when it comes to the way you react. The most productive reaction would have been to seek advice from the community, there's a staggering wealth of knowledge here and no end of helpful people. Alternatively you could have elected to ignore the post here and leave your advert as is (in the hope someone picked it up) or adjusted your advert accordingly. The last choice was to react in the exact way you did, which was to become defensive and abusive, something which will never garner a positive result.
Where you go from here is up to you but as a first impression on this community it leaves a lot to be desired.