My DH is self-employed, contracts come in from all over the UK, his hours aren't regular, they cover weekends, evenings, nights, long times away from home etc etc etc., He cannot plan what work he'll get in.
He loves his career, its also his hobby and passion, and it pays well.
Yes I enable him to continue, he doesn't have to turn anything down because we don't have to worry about childcare. Yes I sacrficed a fair bit to get my life choice and to attain his (my employability).
He has no choice to cut his hours as you have to make hay when the sun shines.
There is no evening/weekend childcare in our area, so my jobsearch is limited. I would have returned to work sooner had I been able to be more flexible and there is work out there for me, and I still have ambitions and aspirations. I happily put them on hold to get these Golden Years, we're not rich but DH's career is getting more solid.
If I had worked full time we would probably have found a way around childcare, but it would have been at either the cost of a contract or a financial cost that would have left us worse off.
Our decision was made easier by the fact I lost my job when pregnant, it was a logical choice as well as one that I wanted.
When I return to work we'll face the same issues to a certain extent, but I feel that now the children are almost school age, its not just for financial reasons that I want to return to work, and we'll work round it. Though childcare will still be a bugger, and it may mean that DH will have to hestitate before accepting work, which will cost him more than the one job he turns down, but future work for that company too.
Clear as mud?
I don't feel the need to justify, but there are perfectly valid reasons for a SAHP to say they are enabling their OH to be successful.