Regardless of how many btc you aim to have, I think everyone interested in criptocurrency should save in btc, with this tought in mind I'm saving half my income every month, from this half one part goes to btc and the other to savings in "real money" just in case, I think is wise to save in btc but I also think no one should put all their eggs in the same basket especially with the chinese threat on the btc, the day people lose their trust in btc we will be doomed, of course thats unlikelly to happen but there is nothing as being too careful