Entry level cameras tend to sell better with a lens than without. Most that are considering a used Rebel want a lens along with it. No lens usually means no or little interest. In my opinion, if you get a kit lens- keep it around to sell with the body later. Let's say, for the sake of argument, that the body only is worth $450, and you outright replaced your kit lens with a $600 lens. The person looking for an used entry level camera with a lens- well- he is not likely wanting to spend $450 for the camera without a lens, nor will they likely want to spend $1050 for the body with a better lens- because- in their minds- it is not worth it- yet. Now, throw that 18-55 on there instead, and sell it for $550- deal... OK, it's all hypothetical- but the point is- an entry level camera with a lens is more attractive than an entry level camera without a lens.
I will also add, I would think that most noobs interested in their first DSLR are more interested in having a ZOOM lens over having a prime. A 18-55 zoom lens is more attractive to them than a 50mm f/1.8 lens is. Want proof- what lens is typically bundled with entry level cameras - directly from Canon- hint: it is not the 50mm f/1.8 - now is it ? As a matter of fact, every DSLR combo, from the entry level cameras to the highest end cameras- all that I know of- are zooms of one sort or another- coming from Canon.
EOS 5D III, EOS 7D,EOS Rebel T4i, Canon 70-200 f/2.8 IS II, Canon 24-105L, Canon 18-135 IS STM, 1.4x TC III, 2.0x TC III, Σ 50mm f/1.4, Σ 17-50 OS, Σ 70-200 OS, Σ 50-500 OS, Σ 1.4x TC, Σ 2.0x TC, 580EXII(3), Canon SX-40, Canon S100
Fond memories: Rebel T1i, Canon 18-55 IS, Canon 55-250 IS, 18-135 IS (Given to a good home)...