Regarding "unsucessful forks" and to see why exchanges have a hard time deciding and HAVE TO decide:

Just the forks from december 2017:

UnitedBitcoin: Forked at Block 498777[8], 12 December 2017, For each 1 BTC you get 1 UB.
Well, it is there - but complicated to claim and will end up with 90% premine.
Price: 293 USD

Bitcoin Hot: Forked at Block 498848[9], 12 December 2017, For each 1 BTC you get 100 BTH
DEAD

Super Bitcoin: Forked at Block 498888, 12 December 2017, For each 1 BTC you get 1 SBTC
Price : 0.30USD

BitcoinX: Forked at Block 498888[10], 12 December 2017, For each 1 BTC you get 10,000 BCX
DEAD

Oil Bitcoin: Forked at Block 498888, 12 December 2017, For each 1 BTC you get 1 OBTC
DEAD

Bitcoin World: Forked at Block 499777, 17 December 2017, For each 1 BTC you get 10000 BTW
DEAD

Lightning Bitcoin: Forked at Block 499999, 19 December 2017, For each 1 BTC you get 1 LBTC
Price 0.02USD (Dead)

Bitcoin Stake: Forked at Block 499999, 19 December 2017, For each 1 BTC, you get 100 BTCS
DEAD

Bitcoin Faith: Forked at Block 500000, 19 December 2017, For each 1 BTC you get 1 BTF
DEAD

Bitcoin Top: Forked at Block 501118, 26 December 2017, For each 1 BTC you get 1 BTT
DEAD

Bitcoin God: Forked at Block 501225, forked on 27th December 2017. For each 1 BTC you get 1 GOD
Price: 126USD which is considered a donation to the community.

Bitcoin FILE: Forked at Block 501225, forked on 27th December 2017. For each 1 BTC you get 1000 BIFI
DEAD

Bitcoin SegWit2X X11 Not to be confused with a previous fork SegWit2X with the same name. Forked at Block 501451, 28 December 2017. For each 1 BTC you get 1 B2X
Price: 194 USD

Bitcoin Uranium: Forking on 31st December 2017, For each 1 BTC you get 1 BUM.
DEAD

Conclusion:

Segwitx2 is ione of the most successful fork from the 14 forks that happened!
And UB is in my eyes a real scam ... perhaps i am wrong.

P.S: BTG and BCH dipped to 110 USD and 205 USD in the beginning.
BCH skyrocketed when people "tried" to dump and whales bought it all ...