Few weeks ago I have saw google of 75$ vouchers for a price 2-3$, now it costs about 8-10$. Why has it increased?
The price of google voucher is increasing bcoz google has banned its three series so availibilty of voucher is limited...
you said the adtext's keywords is increased, i thought many companies use this tool for their business. after then, new year start just now. many companies put into many AD in google.
When there is a shortage of vouchers prices will go up and sometimes double or even triple depending on availability and demand. This is normal and happens with every product in this world.