The skein sp-mod #2 does 1GHASH on the 1080ti. So you need 5 1080ti's to match the speed of the baikal giant x10 . The 1080ti's used to cost around $700 each. total: $3500. The baikal giant X10 cost $8,900.0
Mining Equipment cost are like car leases, you need to consider residual value, not the cost to purchase.
Baikal residual in 1 year is probably 10% or $900. Total cost per month is $667/month
5 x 1080TI residual in 1 year is probably 50% or $1750. Total cost per month is $291/month
Also Baikal may have hard code to partially mine for the ASIC manufacturer like Bitmain S9 does (equipment tax).