There is no point in the agrument. Everybody is right in their context. We are referring to to three different situations.

Ohm's law states that : For a linear divice, and under constant physical conditions (such as temperature and pressure), current flowing through that device is directly proportional to the voltage difference across it. The coefficient of proportionality (voltage in Volts divided by current in Amps) is defined as the resistance of the device in Ohms.

Devices such as receivers, servos and motors behave very closely to a linear device. So higher voltage will result in higher current and higher power consumptions.

Devices such as switching regulator is highly non-linear. So it is possible that as the input voltage increase, the current consumption actually decrease (to keep the power consumption at the load constant). Because of the design of the circuit, the loss internal to the voltage regulator is negligible.

Devices such as linear voltage regulator is non-linear but not to the extent of the switching voltage regulator. As the input voltage increases, the output voltage will be kept constant and so power consumption at the load is constant. The input current will also be constant, however the heat loss internal to the voltage regulator due to the increased voltage drop will increase.

So to sum up, as voltage increases, the current can increase, be constant, or decrease, depending on whether it is a linear, non-linear, or highly non-linear devices respectively.

CKN