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They're being manipulated by speculators trying to make a profit.
Literal
Earn-[volitional-おう] [quotative-と] do speculator-group [by-に] being-manipulated [explanatory-のです].
Finance/news writing. 儲けようとする ('try to profit') uses the [volitional]+とする 'try to' pattern. 投機筋 ('speculator circles, speculative investors,' literally 'speculation group') is a financial term — 筋 ('line, group') is a suffix meaning 'those who engage in X.' 操る ('to manipulate, control') in passive form 操られている ('is being manipulated'). のです adds authority/explanatory weight.