Painted concrete is FAR from maintenance free. A perfect epoxy paint job won't last more than 7 years -- and few paint jobs are perfect. For that matter, few plaster jobs these days last more than 10 years.
The fact is, a well-installed liner pool, with fiberglass steps is probably LOWER maintenance than a concrete pool, much less a mixed concrete + vinyl pool. If you are not careful -- and very, very knowledgeable about concrete design principles AND local ground conditions -- you are likely to end up with recurring leaks at the liner / concrete interface.
Suit yourself, but I wouldn't take any work like that here locally, without getting a written "no-warranty" agreement from the customer.
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