Synergy and El House are ultimately not worth it. while the double jump and additional title count synergy has some use these 2 systems were only made with KR in mind hence the steep cost. 30 mil a week is just too much for synergy. the rotational buffs like Iceburners/el house are just a side benefit for those who spend a lot, like how the treasure hunt event is.

it is actually much more worthwhile to use the ED for more useful stuff.

before el house we had fossil burners and you can see how that turned out. el house just replaces it with a little roleplay/dressup.
I would go so far as to say fishing is the best out of Synergy/El house/pet expedition/seasonal buffs.

so if you want to buy a pack of smokes or beer each week go for it