You need big money for investment in cloud mining that's why I prefer signature campaign, the process is very simple plus you don't need to invest money just time. If you got a good campaign, you hit a jackpot.
Yes, thinking mining is an expensive way because we can't gain more profit if we don't spend much money as for starting capital or investment, unlike doing signature campaign that we can have a good reward without doing investment and yes
I agree that what we need for signature campaign is only time and dedication to comply all rules set by the manager.