Yes I will, because the cost of development will be lower. That makes my customers happy so they give me more work. I'll also have fewer defects which improves my reputation which means I can charge more.
No, your customers don't care two hoots about that.
I mostly write software for SaaS companies. Their customers (the end users of the software) don't care about it much besides seeing fewer problems and getting to use better software, but my customers (the people who own the software) really do.