Staking looks like you can have the cake and eat it. It is not. There is this saying (just paraphrasing, sorry): "Either you get a high interest rate, or you get your money back". (a) you own some BTC and you are the only one who knows the private key (b) you stake your BTC (to a central or more de-centralized service and get 10% interest, (c) you use BTC to purchase (or wrap it into) ALT and stake that for say 20%. In order to go for (b) or (c) you need to know their assumptions (in addition to BTC's), attack vectors (in addition to BTC's), and operational weaknesses (in addition to BTC's). After that body of research, take your decision.