1. If anyone feels that those who bought bitcoin very cheap are just waiting to sell on those who buys now they shouldn't buy, there is no one forcing them to.
They must understand basics.
Buyers want to buy low, sell high for profit.
Sellers want to sell for profit with their lower entries.
At the same price, in the same market, there are buyers who buy bitcoin from sellers, and let's see what they think with their actions. Sellers feel enough with profit and sell, except if they don't have profit but don't have money and emergency forces them to sell, even with loss.
Buyers who buy bitcoins from sellers, because they believe that they are buying cheap and price will rise more after their entry.
It's fair mutual deal between seller and buyer.
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2. The wrongful Idea to him is general, who dares buy a land for $200 and sell in few years for $210 got so that it won't look scammy?
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Investment is risky, sometimes is good and sometimes is bad, but if you have profit, is it deserved to be called as scam?
If you think like this, Gold can be considered as scam by Bitcoin investors especially Bitcoin maximalists.
See ROIs of gold and Bitcoin. In ROI comparison, Gold looks very scammy.
https://casebitcoin.com/