How about granting WG's extended Scan / Hyperspace range tech?

Neptune's Pride Feature Requests
1

Warp gates do cost way more than the extra carriers you would need to buy without them.

I was thinking a +2 tech advantage reach from a given WG would make them a better investment value.

Therefore :
Stars you own without a WG simply reflect the regular range of your technology, but stars with WG’s would get that bonus.

2

Warp gates are expensive because they’re bloody brilliant! They’re already a fantastic tactical tool for speedy reinforcements or defence of key points, I don’t think they need any enhancements to be worth the money.

3

I’d concur with rc_pinchey.