Employers and employees alike do what they do to make money. It may be that the business owners own various property and infrastructure concerning the business, but all levels of staff are involved in making profit possible.
The point of anti-discrimination law is to drive merit as criteria. Even with ENDA, employers can still turn down and fire employees that can't/don't do their jobs, whether they are TG or not. The US nationally has various employment non-discrimination acts offering these protections based off sex, race, color, ethnicity, religion, disability, and genetic information for any "public" businesses. If you oppose ENDA on reasons not related to ->-bleeped-<-, then you should also support the repeal of all these other laws because they might possibly cost a business some money. Is this a correct conclusion?