I have never been a great fan of Messi i Fifa and always prefered the more physical guys liek Ibra, Ronaldo, Lukaku (when he was good),...
And I am a mediocre dribbler at best, so small guys usually dons suit my style, but this year I bought Messi and he is a gamechanger. Fantastic in every way possible. as long as you dont try to outmuscle van Dijk, he is the best possible attacker card that is not an Icon.
Is he worth his prize? He surely is.
Is it worth to wait for him to drop? Absolutely not. If he is 200K cheaper next month, so be it. You can enjoy him in four WL untill then and he will geive you better results, which means better rewards.

If you like him, just get him and dont look back. You will never sell him.