I have been on Level 7 for more than 2 years now. I still haven’t received any rewards for it from Google, barring one lousy coupon.
This doesn’t make sense and is rather demotivating for contributing further. If someone knows anything substantial or better still - a Google Customer Support person is reading this, please help out.
iam lvl8 → never got any reward 
Well, @Tanay_Chaudhari , if it’s any consolation, you have a whole lot of Local Guides to cheer you on as you continue to make positive contributions to Maps. We’re (mostly) all here for the hobby and love of what being a Local Guide means, not for trinkets. Just keep on Mapping and you’ll possibly be granted a reward. If not, then know you’re helping a lot of people, which is pretty huge!
I wholeheartedly echo @JustJake 's sentiments. We didn’t start this journey to initiate rewards, it began as a passion, a hobby, and a commitment to help others.
here you can find more information about receiving awards