Yes and No...
Not trying to sound mean, but I think if you're gauging your chances of getting into a school by the receipt of a marketing email, you have not done enough research on the school and reflection on your own profile.
Remember, a school pockets $200 to review your application so what's the harm in them sending out mass emails if they can get $200 per app? I'm not saying you don't have a chance, but I think if you do enough research on the school and know the weaknesses in your profile, you should have a fair idea on your chances. At the same time, the MBA application process is a holistic process so don't be too hard on yourself either.
I received emails from Booth and Dartmouth too fyi but I know for a fact that I am beyond a long shot there
At the end of the day, take it with a grain of salt. But if you truly love a school and would crawl naked on broken glass to get there, I say go for it.