I tried the same strategy and I think it is very common among the investors as I have seen the same strategy being shared in various websites over the past few months. However, to be honest, I don't even feel like buying a fork like BCH as I have lost my faith on these forks who are nothing but some shitcoins to me right now.
The forks are indeed shitcoins that were generated to derive out extra value from the already existing currency and just to gain a monopoly and name over a particular crypto and claiming to be the main developer for the coin.
And if this strategy worked out that well then no one would ever be in a loss, and thats not the case, youll always need new investors or someone to fall into loss for you to gain profits. Strategies never work much in long term till you know some plans for that particular crypto.