The main reason airdrops are made by companies with crypto currencies is because of that, to be profitable. $100 is definitely possible, without doubt, but if everything is going to plan. Sometimes even more than $100 are possible, if the value increases of course. The chances of the token being really valuable and sellable are slim, but its definitely possible. I see airdrops as one of the lowest points of a company, so I try to stay away from the ones that start with them.