Avaricifer Donation Strategy

I've been looking at the Avaricifer rewards now that IGG has scaled back the maximum amounts you can contribute.  The limits are are now 2m gold/mana per day.  Obviously at this point contributing maximum gold and mana per day is a no-brainer.  But what about merits and honor badges?  Is it worthwhile to contribute them?

Even though we get ranked, the rewards for Avaricifer are not based on relative standings.  Rather, they are based only on the total amount you give.  Here is the reward table:

Note that you get all of the rewards of lower levels of donation at a higher level.  So, if you give the maximum donation (180000+ "donation points"), you get:
  2x mythic crest bag, 2x rare crest box, 2x crest chest, 2x mythic crest chest
You can see this on the leaderboard.  All the top guys get this reward.

Currently it is the second day of the contest, and the Avaricifer is 37% done.  So, it appears that it will take either four or five days to complete the contest.

So far I have given just gold and mana, twice each, scoring 44000 donation points.  Thus, we can compute easily that at this rate, I will end up at either 88000 or 110000 points.  So I'll get the two rare crest boxes, no problem.  I will get one crest chest, and I may or may not get the other.

Mythic crest chests give level 3 mythic crests; obviously, that is a nice reward.  But a crest chest (not rare or mythic) gives a level 3 (basic) crest; and that is not much of a reward.  The only basic crest I would use is a slowdown crest; all others I would forge in the attempt to get something useful.  Forging rarely produces a desirable crest.

To get one of the mythic crest chests, I would have to donate an additional 25000 or 47000 donation points.  To get both, I would have contribute an additional 70000 or 92000.

One more part of the puzzle is the cost to donate.  Again, I've maxxed out gold and mana and assumed I will max it out for all two/three remaining days.  So the only things I can contribute are shards and honor badges.  One can contribute up to 400 shards/day, earning 20000 donation points for max donations.  For honor badges, the limit is 20000 hb/day earning 20000 donation points.

So, we have the possibility here to convert either shards or honor badges into mythic level 3 crests.  To get one additional level 3 mythic crest will require 500/940 shards, or 25000/47000 honor badges.  Getting two additional level 3 mythic crests costs 1400/1840 shards, or 70000/92000 honor badges.

Given the uncertainty in the event timing, what seems wisest to me at this point is to aim for the 135000 level in four days.  Then if there is a fifth day, go for the maximum.  I can still give shards today, so I have up to three days worth I can give.  That's plenty to get to 940.  If there is an fifth day of the contest, then I can contribute 22000 from gold/mana, and make up the remaining 23000 using mostly shards and some honor badges.