Nah, that's pretty much the entire industry, even the ones that don't call themselves startups anymore.
It's pretty standard when you're a salaried employee.
It boosted my annual salary noticeably, because we worked 45-50 hours nearly every week. I hear that the OT policy still exists, but few people still get OT because of the DoD sequester. But in 2010-2012, it was very nice.