Sure, it could be a little problematic if you are buying directly from a person, and sometimes, they might have a minimum that is several hundred dollars before they will even transact with you because they do not want to be having to interact with you with small transactions, so maybe in those cases you would have to wait several weeks or even several months before the amount of money that you have is high enough to meet their minimum transaction threshold.
Yeah that's true, in most cases they tend to charge more higher because in every transactions there is always a gas fee so the seller will always make sure the buyers covers for the fees, perhaps even if the seller agrees to sell to him with any amount provided he pays for the gas fees the buyer will still lose because by the time some percent of gas fees will be deducted from each buys his accumulation targets will completely change, the best way is to buy from an exchange were as he could buy any amount he desires with a risk free instead of buying from someone which perhaps may have other criteria or minimum transaction amount before transacting.