Ok so rough estimates here:
Assumptions:
- Used 20 gems per hour for building & research skip times (seems roughly what it is for my current buildings)
- 25 gems per hour for skipping the HA10 re-training time (same as Training Camp)
- 4,420 gems for a full Iron Refill (based on my current max of 2707k Iron)
- 5,100 gems for a full Food Refill (based on my current max of 3134k Food)
Total Gem Skips for Building:
Building SH25 = 6,490
Building HA 1->10 = 26,901
Researching HA10 = 6,720
Total = 40,111 gems
Total Gem Skips for Iron Resources:
SH25 = 0 (assume they had this one ready)
HA 1->10 = 44,200
Total = 44,200 gems
Food Costs
Research Cost = 0 (assume they had this one ready too)
HA10 Cost = 5,100 gems per 2 attempts
Skip Costs
Cost to Skip HA10 = 4,200 per attempt
No. of Attempts needed:
Based on 5% chance to get ANY non-S1 5* hero; the odds of getting Gravemaker or Panther specifically is 0.1%.
Cumulative Probability Maths:
25% chance of specific hero = 287 Attempts = 1,937,250 gems
50% chance of specific hero = 693 Attempts = 4,677,750 gems
75% chance of specific hero = 1386 Attempts = 9,355,500 gems
99% chance of specific hero = 4603 Attempts = 31,070,250 gems
Total Gems working off a 50% chance = 4,677,750 + 44,200 + 40,111 = 4,762,061 gems = $47,615.85 USD
Compare that to 50% odds of just summoning G. Panther from Event Summon = 347 Summons = 910,00 gems = $899.91 USD
Or a 50% odds of summoning Gravemaker from Legends Portal = 1,333 Summons = 358,000 gems = $3,579.65 USD
So Short Answer = NO