@xahteiwi Obviously this is only my experience, but I've never met anyone who was swayed by the size of a company's sponsorship or booth size in a good way. I guess having a dinky booth can work against big vendors by seeming too cheap, but I've never known swag or booth size to correlate with any success metric.
That said, handing out swag + material goes alongside conversations which is important. Talks alone don't supplant that.
And, depending on event, no sponsorship may mean no talk.