bitcoin are so much expensive now , and litecoin are so much cheaper people start accepting them as well
And this will have a knock on-effect. Once BTC price gets ridiculous - maybe it already has - people will just invest in the next biggest currency; Litecoin. Then when Litecoins get too pricey; on to the next and so on.
Nope, by your logic, smarter would be start with new and still worthless alternative coin.
Litecoin is already too much expensive + useless