Analyzing odds data via API, what is the consequence of having virtual odds included?

[johnchat]

(I hope I understand virtual odds. I do understand back/lay concept)

Context

For the sake of simplicity, take a tennis event....

[main_pl]

Hello,

for April Graphs API is scheduled to be released;
is anyone knows anything about it?

in particular, maybe...

[hellaeon]

Hi all,

I have come to notice that after the start of an AFL match, the odds are sometimes still exisiting as such the last recorded odds...

[bnl]

Looking at the data at dat.befair.com, I see no lay-prices.
Would most of you agree that for simulation purposes,
I can assume lay-price...