I would do the same if I don't get any good and profitable investment source..
saving bitcoin it self a good way to get profit. because bitcoin price willincrease. but there is some concern in holding bitcoin. first is bitcoin price is unpredictable . future price increase is not guaranteed. and 2nd is to get hack and lose money..
I think you can save them in a paper wallet so that it will not be easy for anyone to hack them, but yes there is no assurance that price will rise in future which can give us good profits.
paper wallet would do but still have some risk if you intend to keep for longer years which those prints would be faded and other information on it . No matter what wallet do you use there still risk on lossing your coins. 10 btc is already a big amount which you could do some things with it but majority of us here choses to keep it for long time.