You bring up a very good point about ARDR + IGNIS "diluting" each other. I like to think of this as Bitcoin + Litecoin rolled into one. As you say, Ignis can be used for day to day transactions kind of like the US dollar (using a fiat example) and Ardor can act as the reserve or "store of value" backing behind Ignis (like gold backing).
I agree, good example with BTC/LTC.
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IMHO I'd like to see a 10:1 or 10:2 value ratio of Ardor to Ignis. This hinges on there being more than 1 economically active chain on the Ardor motherchain. So I guess what I'm saying is that a fair market value for Ardor should be around $10 and for Ignis around $1 to $2 for _now_.
I would place the current fair Ignis price a lot higher, at least at 50% of the Ardor price. Ignis, for now, is the only really important general-purpose childchain, and it will continue to be so in all 2018 if I interpret the Jelurida roadmap the right way. Bitswift, AEUR and the other planned child chains for this year are much less significant. For the medium-to-long term, the value of Ardor with respect to Ignis should however tend to increase to 10:3 or 10:2, once the child-chain ecosystem is fully developed. 1:10 is a bit low for Ignis, as it is supposed to continue to be the main general-purpose currency of the ecosystem, while the overwhelming majority of the other chains will be niche-currencies like in-game tokens.
@jtbitz1: Good decision. However, I think the return rate currently would be very low, while in the future, the more child chains are active, you will get a decent amount of transaction fees. But more forgers support the network and help sustain its value/price.
Once more exchanges get their Ardor daemons ready I see no reason why Ardor/Ignis should not be worth $10 or more. 
