Most groups just run from one spider camp to another for max tokens/relics. Ignoring mini bosses and rangers/caster along the way. Then screaming why they wiped?
After wave 9/10 you have to focus on mini bosses and rangers/casters first or they will overwhelm you.
Just ignore spider camps if you cant progress, reach w15 and go buy a weapon.
Farming camps is better on low waves (1-5/9).
Farming legendary gems on higher waves (15+) needs some coordination and players not to be greedy (pulling camps).
PS: if you have probs with rangers/casters, just brake LoS and wipe them with some AoEs. Good place is behind resspad (but be aware of meteors/poison and mini bosses like witch/concubine).