So you are a member of and have status with
Miles & More -> LH? (Star Alliance)
Flying Blue -> KLM/AF? (Skyteam)
Skywards -> EK (non aligned)
Privilege Club --> QR (Oneworld)
Having multiple ffp’s with low balances is never a good idea. You never get enough ff miles/points to be of use before they expire. FFP’s are for the long term. However at times it makes sense to have a ff membership with an airline in another alliance. (e.g. Oneworld & Star)
Some of those ffp's have a hard expiry. That is use the frequent flyer miles or loose them.
http://www.flyertalk.com/forum/miles...-t-expire.html
When do the QR ff points expire and what will use them for?
You could build up the QR points with the BA & AY flights and then use them.
http://www.wheretocredit.com/ba
http://www.wheretocredit.com/ay
Then credit to the BA ffp. Being Eu based long term BA may be a better ffp. But has savage surcharges on most, but not all, award flights.
USA based airline ffp's tend to be more generous (status benefits/earn/burn/upgrades/award cost/award cash surcharges/expiry/affiliated credit card ff mile earning/promotions) compared to non USA based airline ffp’s (even after the recently announced changes to some USA ffp’s). But if you are not flying the airline of your ffp the useful benefits are somewhat limited.
Until a few years ago, the default recommendation for many if flying a range of airlines was a USA based ffp. But with the change of most USA based ffp's to revenue based, flying the airline with best fares and best schedule that matches your requirements now has merit. And treating any ff miles as a bonus that may or may not be able to be used.
The airline you fly and the airline ffp you credit those flights to does not need to be the same.
The airline you fly most or an airline of the country you live is the best ffp for many people. Generally however you are better earning on your primary airline due to greater recognition, better service when disruptions, ability to upgrade flights and possible operational upgrades.
Earning miles from non flying activities is easier with an airline of your home country.